package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.channels.MulticastChannel;
import java.util.HashMap;
import java.util.UUID;

@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    //添加路径
    @Value("${reggie.path}")
     private String basePath;

    /**
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //创建一个目录对象
        File dir=new File(basePath);
        //判断yml图片转存路径是否存在
        if (!dir.exists()){
            dir.mkdirs();
        }

        //获取原始文件名
        String originalFilename = file.getOriginalFilename();//例如 a.jpg
        //截取
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));//得到 ==>.jpg

        //拼接路径名,给临时文件命名,考虑到后期会重复用到某张图片
        String fileName = UUID.randomUUID().toString()+suffix;

        //将临时文件转存到指定位置
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }


        return R.success(fileName);
    }

    /**
     *
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            FileInputStream fis=new FileInputStream(new File(basePath+name));
            ServletOutputStream sos = response.getOutputStream();
            IOUtils.copy(fis,sos);
            fis.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
